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What can cause the engine on my 1999 Oldsmobile 88 LS 3.8L (3800 series 2) to make a loud air sucking sound in my intake manifold

After my 1999 Oldsmobile is warmed up and I start it up I can hear a loud air sucking sound going into my intake manifold , the rpm gauge flutters up and down , after a minute or so I revs up to 2000 rpm then returns to a normal idle but as I drive and take my foot off the gas pedal the engine stalls , I can shift into neutral and start the engine again . Any suggestions would be very helpful .

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  • paulchase11
    paulchase11 Jul 31, 2013

    Where the heck is the charcoal filter canister located on my 1999 Oldsmobile 88 LS 3.8L because I can't repair it if I can't find it first

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  • Cars & Trucks Master
  • 5,332 Answers

With the engine running open the hood and look/listen for a vacuum leak. One of the larger vacuum hoses has likely come off.

Posted on Jul 25, 2013

  • Jeremy W.
    Jeremy W. Jul 31, 2013

    The charcoal canister has nothing to do with this. You looking for vacuum leaks under the hood.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 81 Answers

SOURCE: stalls and wont idle when cold

Re the trooper. You have a couple of possibles. The most likely is the glowplugs or glowplug relay. Don't be fooled into thinking glow plugs only heat to start - the also do whats called postheat. That is to raise the cylinder temp until the block is warm. IF they are not functioning (clip a light onto one whilst switching the glowplug on to test the relay) this is common.
Most likely is a stuck EGR valve - stuck open so running a very lean mix when cold. Its two bolts on the inlet manifold, pulls out and looks covered in soot - it should push in and spring out. Can be cleaned in petrol or alcohol or with compressed air.
More remote is possible you have a faulty injector...only really testable by an engine centre...

Posted on Jan 26, 2009

bunnydawg
  • 5158 Answers

SOURCE: Air sucking noise from below the intake manifold.

Look for a vacuum hose that isn't hooked up

Posted on Feb 13, 2009

  • 51 Answers

SOURCE: bmw 3 series idle problem

Its most likely a timing problem. unfortunatly this can only be done by a computer! So bring it to a dealership or somene in the know with a diagnostic machine.

Posted on Apr 27, 2009

  • 1 Answer

SOURCE: idle problem

Try to disconnect the Air Flow Meter. It is the first plug just before the air filter/air intake box. If this improves your situation you will need to source a new or aftermarket Air Flow Meter.

Posted on Apr 28, 2009

ourhowse
  • 2007 Answers

SOURCE: 1991 Oldsmobile Cutlass Ciera idles high

Change your idle control sensor, but first make sure your throttle linkage isn't sticking.

Posted on Jun 03, 2009

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